[DAG] Use UndefPoisonKind enum in isGuaranteedNotToBeUndefOrPoison/canCreateUndefOrPoison/getFreeze (#196145) Replace the PoisonOnly flag and allow discrimination between undef/poison values - to more closely match ValueTracking / GISel implementations. This patch is mainly a drop in replacement for the PoisonOnly logic, and hasn't added anything to match UndefOnly logic (e.g. for SelfMultiply patterns) - we can improve upon this later on with proper test coverage. Fixes #194818
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